Side wall for a spread axle trailer



FIG. 1 is a perspective view of a side wall for a spread axle trailer showing my new design, it being understood that the broken lines are for illustrative purpose only and form no part of the claimed design; and,

FIG. 2 is a side elevation view thereof.

The opposite side of the design is flat and unornamented. 

The ornamental design for a side wall for a spread axle trailer, as shown and described. 